org.caleydo.core.util.function.Functions2.java Source code

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Here is the source code for org.caleydo.core.util.function.Functions2.java

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/*******************************************************************************
 * Caleydo - Visualization for Molecular Biology - http://caleydo.org
 * Copyright (c) The Caleydo Team. All rights reserved.
 * Licensed under the new BSD license, available at http://caleydo.org/license
 *******************************************************************************/
package org.caleydo.core.util.function;

import com.google.common.base.Function;
import com.google.common.collect.Table;

/**
 * utility class for {@link Function2}
 *
 * @author Samuel Gratzl
 *
 */
public class Functions2 {
    /**
     * create a lookup function based on a table
     *
     * @param table
     * @return
     */
    public static <F1, F2, T> Function2<F1, F2, T> fromTable(final Table<F1, F2, T> table) {
        return new Function2<F1, F2, T>() {
            @Override
            public T apply(F1 input1, F2 input2) {
                return table.get(input1, input2);
            }
        };
    }

    /**
     * wrapper for swapping arguments
     *
     * @param f
     * @return
     */
    public static <F1, F2, T> Function2<F2, F1, T> swap(final Function2<F1, F2, T> f) {
        return new Function2<F2, F1, T>() {
            @Override
            public T apply(F2 input1, F1 input2) {
                return f.apply(input2, input1);
            }
        };
    }

    public static <F1, F2, T> Function<F1, T> partial(final Function2<F1, F2, T> f, final F2 value) {
        return new Function<F1, T>() {
            @Override
            public T apply(F1 input) {
                return f.apply(input, value);
            }
        };
    }

    public static <F1, F2, T> Function<F2, T> partial2(final Function2<F1, F2, T> f, final F1 value) {
        return new Function<F2, T>() {
            @Override
            public T apply(F2 input) {
                return f.apply(value, input);
            }
        };
    }
}